Installation manual

Simrad SD570

850--160137 / A

Figure 5 - OMNI/Vertical combination

The combination of the OMNI mode and the vertical slice, will

give an optimal visualizing of the catch situation. In addition

to the OMNI picture, the vertical slice is especially useful for

visualizing the vertical distribution of a school of fish. In that

way, it is not necessary to go over the target to see the

distribution on the echo sounder, which often results in a

spreading of the school.

When the optional stabilization system is installed in the

sonar, the transducer will be stabilized electronically for roll

and pitch up to approximately ±30°. The stabilization may be

switched ON and OFF in the menu.

The OMNI/vertical combination is used in several display

modestogivethebestsituationoverviewforbothpurseseiners

and trawlers. In these presentations the seine net and the

trawlcanbeseeninrelationtothevessel,theschooloffishand

the bottom.

3.3 FM (Frequency Modulation)

In addition to the traditional single frequency transmitting

method, the SD 570 sonar isequipped with an FM correlation

mode.

In FM mode each transmission pulse containsup to 8 different

frequencies, and the receiver makes a spectrum analysis and

compares the received echoes with the transmitted frequency

code. This provides a filtering effect, which efficiently reduces

interference, noise and reverberation. In addition to giving a

clean and stable echo presentation, this also increases the

sonar’s detection range